应急机场土质道面疲劳变形特性模型试验

发布时间：2018-11-10 18:05

【摘要】：为分析应急机场快速修建工程的合理道面结构形式,采用人工加载和道面电液伺服疲劳试验机加载2种方式,对由压实土基、稳定土基层(底基层)和功能性面层组成的典型道面结构疲劳变形特性进行了模型试验.研究了土质道面结构的累积塑性变形、回弹弯沉和弯沉盆曲线随飞机荷载、施加荷载频率和荷载作用次数的变化情况及其平面分布规律.试验结果表明:累积塑性变形随加载频率增大而增大,累积塑性变形与加载次数呈对数关系;弯沉盆曲线形状类似"S"型曲线,可采用四次曲线方程进行拟合;道面结构的早期整体回弹模量增长较快,7~60 d龄期内整体回弹模量可达200~500 MPa,在数万次通行次数下,土质道面的回弹弯沉小于1 mm,表明提出的土质道面结构形式能够满足应急机场强时效性的要求.
[Abstract]:In order to analyze the reasonable pavement structure of the rapid construction project of emergency airport, two ways of manual loading and electro-hydraulic servo-fatigue testing machine loading are adopted, and the compacted soil foundation is compacted. The fatigue deformation characteristics of typical pavement structure composed of stable soil base (bottom base) and functional surface were tested. The cumulative plastic deformation, springback deflection and sinking-basin curves of soil pavement structures are studied. The variation of loading frequency and loading times with aircraft loads and their plane distribution are studied. The experimental results show that the cumulative plastic deformation increases with the increase of the loading frequency, and the cumulative plastic deformation is logarithmic with the loading times, and the curve of the sinking-basin is similar to the "S" curve, which can be fitted by the four-degree curve equation. The early integral modulus of springback of pavement structure increased rapidly, and the overall modulus of springback reached 200,500 MPa, during the period of 7 ~ 60 days. Under the condition of tens of thousands of traffic times, the springback deflection of soil pavement was less than 1 mm,. The results show that the proposed soil pavement structure can meet the requirements of strong timeliness of the emergency airport.
【作者单位】：空军工程大学机场建筑工程系;中国人民解放军95942部队保障部;济南军区建筑设计院;
【基金】：军队科研项目(AKJ10J004)
【分类号】：U416.211

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